The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 26, 1977
Filed:
Apr. 11, 1975
Applicant:
Inventor:
Donald C McDonald, Sherborn, MA (US);
Assignee:
O. S. Walker Company, Inc., Worcester, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
335286 ; 335291 ;
Abstract
The lifting magnet disclosed herein is adapted for lifting layered pipe. The pipe is engaged by a pair of elongate pole pieces which extend transversely to the length of the pipe, the pole pieces being energized by at least one coil disposed therebetween. The pole pieces are of essentially uniform thickness over most of their length but have substantially thicker portions adjacent each end so as to provide, to a pipe contacting the ends of the pole pieces, an approach flux path of cross-sectional area substantially equal to the cross-sectional area of the approach flux path presented to a pipe contacting the pole pieces intermediate their ends.